WAgkistrodon bilineatus
WBig-scaled blind snake
WBlack milk snake
WBoa constrictor
WBoa imperator
WBothrops
WBothrops asper
WBrown sipo
WCerrophidion godmani
WCorallus annulatus
WCorallus ruschenbergerii
WDendrophidion percarinatum
WGarter snake
WImantodes gemmistratus
WImantodes tenuissimus
WLachesis (genus)
WLachesis melanocephala
WLachesis stenophrys
WLeptodeira septentrionalis
WLeptophis ahaetulla
WLeptophis mexicanus
WLeptophis modestus
WLoxocemus
WMasticophis schotti
WMetlapilcoatlus mexicanus
WMicrurus browni
WMicrurus diastema
WMicrurus mipartitus
WMicrurus nigrocinctus
WMilk snake
WMussuranaWMussurana (species)
WNinia sebae
WOxybelis fulgidus
WOxyrhopus petolarius
WPhrynonax poecilonotus
WPituophis lineaticollis
WPliocercus euryzonus
WPorthidium nasutum
WPorthidium ophryomegas
WRoatan coral snake
WScaphiodontophis venustissimus
WSibon dimidiatus
WSibon longifrenis
WSibon sanniolus
WSonora palarostris
WSpilotes pullatus
WTantilla melanocephala
WTrachyboa boulengeri
WTrimorphodon
WUngaliophis panamensis
WWestern shovelnose snake